Each MAX II device has four dual-purpose dedicated clock pins (GCLK[3..0], two
pins on the left side and two pins on the right side) that drive the global clock network
for clocking, as shown in Figure2–13. These four pins can also be used as general-
purpose I/O if they are not used to drive the global clock network.
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以上是datasheet里的东东,
难道说我使用了GCLK0作时钟输入,所以其他全局时钟口都不能用了吗??
最后的"if they are not used to drive the global clock network"
是说某GCLK "not used to drive the global clock network" 就可以作IO,
还是说当有一个GCLK "used to drive the global clock network" 时,其他都不可以作IO??
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